Journal of the Iranian Chemical Society

, Volume 4, Issue 3, pp 347–363 | Cite as

Preparation and operating conditions for cobalt cerium oxide catalysts used in the conversion of synthesis gas into light olefins

  • A. A. Mirzaei
  • M. Galavy
  • A. Beigbabaei
  • V. Eslamimanesh
Article
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Abstract

Cobalt cerium oxides, prepared using a co-precipitation procedure, were studied as catalysts for the conversion of synthesis gas to light olefins (C2-C4). Specifically, we studied the effect of a range of preparation variables, including the molar ratio of the [Co]/[Ce] of the precipitation solution, ageing time and calcination temperature. In addition, the effects of supports and promoters on the catalysts’ activity and selectivity and a range of reaction temperatures using synthesis gas with different H2/CO molar feed ratios were investigated. The catalyst containing a molar ratio of 80% Co and 20% Ce, aged for 2 h, supported with 15 wt% SiO2 without any promoter, at an operating temperature of 450 °C and an H2/CO feed ratio of 2/1 (GHSV = 4500 h−1), performed optimally for the conversion of synthesis gas to light olefins. The characterization of both the precursors and the calcined catalysts by powder X-ray diffraction, scanning electron microscopy, Brunauer-Emmett-Teller specific surface area measurements and thermal analysis methods, including TGA and DSC, show that all the preparation variables influenced the catalyst precursor structure.

Keywords

Co-precipitation Ageing time Fischer-Tropsch synthesis Light olefins Cobalt cerium catalyst Characterization 
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Copyright information

© Iranian Chemical Society 2007

Authors and Affiliations

  • A. A. Mirzaei
    • 1
  • M. Galavy
    • 1
  • A. Beigbabaei
    • 1
  • V. Eslamimanesh
    • 2
  1. 1.Department of Chemistry, Faculty of ScienceUniversity of Sistan and BaluchestanZahedanIran
  2. 2.Iran Polymer and Petrochemical InstituteTehranIran

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